Vintage Trumpet Parts

Anybody Have A Source For Parts For A 1939-40 Martin Handcraft
Imperial. Looking For Valve Caps Bottom. At Some Point In Time
Someone Took A Wrench To Mine. Horn Just Had A New Valve Job
And Looks And Plays Great But I Can't Get Over Or Past Those
Ruined Caps. Somethings Just Really Bother Me, You Know What I Mean. Any Help Greatly Appreciated, I Have Checked The Web With No Luck.